What quantity of protein is sufficient for healthy and fast growth of hair?

Moderate: 0.5 g per kg of body wt if you have a sedentary life. 0.5-0.75 g per kg of body wight if moderate activity. 0.75-1.0 gr in moderate physical activity for body building 1-1.5 gr per kg of body weight

Protein.: Many experts believe that most of us get more than enough protein daily. In fact, some believe the average sedentary american eats about 50% more than the recommended daily amount, which ranges from 40-70 grams each day depending on your gender, age and situation. I f you have an absorption problem then the rules change.

Normal diet: Hair growth in influenced by many things including hereditary factors, age, serum iron, hormones, medicines, emotional factors etc. A "normal" diet should contain usual nutrients to insure good health and hair growth taking into account the above. It has been suggested the biotin (part of the b complex list of vitamins) will help hair growth as will over the counter shampoos like rogaine (minoxidil) product.